I am new to 2-strokes. I saw a demo on how 2-strokes build crankcase pressure and understood it but it was for a Single cylinder motorcylce app. My Question - seeing as though a mutilple cylinder shares the same crankcase space - how does the crankcase ever build and maintain pressure with mutilple cylinders if one cylinder is going up while the other is going down. It would seem that one cylinder would work against the other .It would also seem to me that the backpressure on the exhaust stroke would conflict with what the other cylinder is doing. Any help in understanding ?